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I just noticed that my message seems contradictory, hehe.
So, we inspected the room (starting with the ceiling of the room). We opened the door to the right corridor (we are in a doorway formation). Tsukiko carefully examined the right corridor (without entering). The ceiling and the water next to the corridor – that's all. If there is nothing there, we won't go there anyway. First answer whether it looks clear, as far as we can tell.